First of all, I would like to clarify that causality is, in my opinion, the best story app of all time. Furthermore, I think there is a few features that if added would make the overall experience much better.
More detailed character profiles
A way to world build like a pro
Being able to reference notes while you write
Creating a magic system professionally
Making the research area more like an encyclopedia
Having a pre-built thesaurus
Text correction tools
Word target section
Other than those I am very excited to what you're going to do with causality 3.0, I myself an most excited for the mobile thingy and the sync option. Oh, if we would be able to integrate with shot designer it would be amazing. Hope this helps!